Most of Earth's surface is covered by water. Water can be salty or fresh. The water in oceans is (26)___ of salt. Fresh water is found in lakes and rivers, under the ground, in the air, or (27)___ in ice caps and glaciers. The water we have now on Earth is all the water we will ever have. The water on Earth is always moving through the water cycle. A cycle is something that (28)___ over and over. Water starts in the ocean or on land. It then evaporates, or changes from a liquid to a gas. The gas forms clouds. Water changes from a gas to a (29)___ oceans. when it rains. It falls back to land or into the oceans. Many things can happen to water as it falls from the clouds to Earth. In cold places, the water freezes. It makes snow or ice. It can become part of a glacier or an ice cap. In (30)___places, water falls as rain. Some of the rain flows into oceans, rivers, and lakes. Some of it soaks into the ground. 26. A. thirsty   B. full   C. crowded   D. rich 27. A. frozen   B. melted   C. heated   D. driven 28. A. separates   B. creates   C. happens   D. repeats 29. A. water   B. liquid   C. cloud    D. rainbow 30. A. taller   B. lower   C. warmer   D. colder